<?php

if (! defined('BASEPATH'))
    exit('No direct script access allowed');

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package CodeIgniter
 * @author ExpressionEngine Dev Team
 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license http://codeigniter.com/user_guide/license.html
 * @link http://codeigniter.com
 * @since Version 1.0
 * @filesource
 *
 */
    
// ------------------------------------------------------------------------

/**
 * MySQL Utility Class
 *
 * @category Database
 * @author ExpressionEngine Dev Team
 * @link http://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_utility extends CI_DB_utility
{

    /**
     * List databases
     *
     * @access private
     * @return bool
     */
    function _list_databases ()
    {
        return "SHOW DATABASES";
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Optimize table query
     *
     * Generates a platform-specific query so that a table can be optimized
     *
     * @access private
     * @param
     *            string the table name
     * @return object
     */
    function _optimize_table ($table)
    {
        return "OPTIMIZE TABLE " . $this->db->_escape_identifiers($table);
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Repair table query
     *
     * Generates a platform-specific query so that a table can be repaired
     *
     * @access private
     * @param
     *            string the table name
     * @return object
     */
    function _repair_table ($table)
    {
        return "REPAIR TABLE " . $this->db->_escape_identifiers($table);
    }
    
    // --------------------------------------------------------------------
    /**
     * MySQL Export
     *
     * @access private
     * @param
     *            array Preferences
     * @return mixed
     */
    function _backup ($params = array())
    {
        if (count($params) == 0) {
            return FALSE;
        }
        
        // Extract the prefs for simplicity
        extract($params);
        
        // Build the output
        $output = '';
        foreach ((array) $tables as $table) {
            // Is the table in the "ignore" list?
            if (in_array($table, (array) $ignore, TRUE)) {
                continue;
            }
            
            // Get the table schema
            $query = $this->db->query(
                    "SHOW CREATE TABLE `" . $this->db->database . '`.`' . $table .
                             '`');
            
            // No result means the table name was invalid
            if ($query === FALSE) {
                continue;
            }
            
            // Write out the table schema
            $output .= '#' . $newline . '# TABLE STRUCTURE FOR: ' . $table .
                     $newline . '#' . $newline . $newline;
            
            if ($add_drop == TRUE) {
                $output .= 'DROP TABLE IF EXISTS ' . $table . ';' . $newline .
                         $newline;
            }
            
            $i = 0;
            $result = $query->result_array();
            foreach ($result[0] as $val) {
                if ($i ++ % 2) {
                    $output .= $val . ';' . $newline . $newline;
                }
            }
            
            // If inserts are not needed we're done...
            if ($add_insert == FALSE) {
                continue;
            }
            
            // Grab all the data from the current table
            $query = $this->db->query("SELECT * FROM $table");
            
            if ($query->num_rows() == 0) {
                continue;
            }
            
            // Fetch the field names and determine if the field is an
            // integer type. We use this info to decide whether to
            // surround the data with quotes or not
            
            $i = 0;
            $field_str = '';
            $is_int = array();
            while ($field = mysql_fetch_field($query->result_id)) {
                // Most versions of MySQL store timestamp as a string
                $is_int[$i] = (in_array(
                        strtolower(mysql_field_type($query->result_id, $i)), 
                        array(
                                'tinyint',
                                'smallint',
                                'mediumint',
                                'int',
                                'bigint'
                        ), // ,
                                                                                    // 'timestamp'),
TRUE)) ? TRUE : FALSE;
                
                // Create a string of field names
                $field_str .= '`' . $field->name . '`, ';
                $i ++;
            }
            
            // Trim off the end comma
            $field_str = preg_replace("/, $/", "", $field_str);
            
            // Build the insert string
            foreach ($query->result_array() as $row) {
                $val_str = '';
                
                $i = 0;
                foreach ($row as $v) {
                    // Is the value NULL?
                    if ($v === NULL) {
                        $val_str .= 'NULL';
                    } else {
                        // Escape the data if it's not an integer
                        if ($is_int[$i] == FALSE) {
                            $val_str .= $this->db->escape($v);
                        } else {
                            $val_str .= $v;
                        }
                    }
                    
                    // Append a comma
                    $val_str .= ', ';
                    $i ++;
                }
                
                // Remove the comma at the end of the string
                $val_str = preg_replace("/, $/", "", $val_str);
                
                // Build the INSERT string
                $output .= 'INSERT INTO ' . $table . ' (' . $field_str .
                         ') VALUES (' . $val_str . ');' . $newline;
            }
            
            $output .= $newline . $newline;
        }
        
        return $output;
    }
}

/* End of file mysql_utility.php */
/* Location: ./system/database/drivers/mysql/mysql_utility.php */